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参数

在Revit平台API中，每个图元对象都有参数属性，它是隶属于图元所有属性的集合，在此集合中更改属性值。

• 每个图元的参数都有一个与之关联的ElementId类型的ID
• 大多数参数是Revit内置的
• 还有一部分是存储在硬盘外部共享参数文件的共享参数

Revit API中参数相关的类

• Autodesk.Revit.Parameters.BuiltInParameter枚举：Revit内建参数枚举
• Parameter类: 参数
• Defination类：参数定义类
• ParameterType枚举: 参数类型枚举

通过Lookup获取参数，点击Parameter得到该元素所有参数

选择你想获取的参数，然后点击Definition

读取

1. e.Parameters

2. e.GetParameters(string name)

3. e.get_Parameter(BuiltInParameter parameterId)

4. e.LookupParameter(string name)

写入

判断该参数是否是ReadOnly (p.IsReadOnly)

判断该参数交互时是否可修改(p.UserModifiable)

判断该参数的StorageType

将要写入该参数的值转换为相应的数据类型，然后Set().

外部存储

Revit API允许创建Schema类数据结构并将它们的实例附着到Revit模型中的任何Element。

Revit API中外部存储相关的类
Sechema:数据结构
SchemaBuilder：数据架构编辑器
Field：字段
FieldBuilder：字段编辑器
Entity：数据实体

Schema

using Autodesk.Revit.UI;
using System;
using System.IO;
using System.Linq;
using Autodesk.Revit.DB;
using System.Collections.Generic;namespace ParameterBasicDemo
{[Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]public class CreateSharedParameterCmd : IExternalCommand{public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements){try{string dllLocation = string.Empty;string sharedFile = string.Empty;dllLocation = "D:\\";sharedFile = Path.Combine(dllLocation, "SharedParameters.txt");//需要文件存在commandData.Application.Application.SharedParametersFilename = sharedFile;DefinitionFile defFile = null;defFile = commandData.Application.Application.OpenSharedParameterFile();using (Transaction tran = new Transaction(commandData.Application.ActiveUIDocument.Document)){tran.Start("创建共享参数");try{// 创建、获得共享参数DefinitionGroup defGroup = defFile.Groups.Create("BasicDemo");Definition def = defGroup.Definitions.get_Item("BasicDemoId");ExternalDefinitionCreationOptions edcOpt = new ExternalDefinitionCreationOptions("BasicDemoId", ParameterType.Text);//高版本不能用ParameterType要用ForgeTypeId(在SpecTypeId类中)if (null == def){def = defGroup.Definitions.Create(edcOpt);}// 获得墙类别集合CategorySet cs = new CategorySet();Category wallCategory =commandData.Application.ActiveUIDocument.Document.Settings.Categories.get_Item(BuiltInCategory.OST_Walls);cs.Insert(wallCategory);// 实例绑定InstanceBinding instBd = commandData.Application.Application.Create.NewInstanceBinding(cs);commandData.Application.ActiveUIDocument.Document.ParameterBindings.Insert(def, instBd);if (TransactionStatus.Committed != tran.Commit()){TaskDialog.Show("共享参数", "事务提交失败！");}}catch{tran.RollBack();throw;}}return Autodesk.Revit.UI.Result.Succeeded;}catch (Exception ex){message = ex.Message;return Autodesk.Revit.UI.Result.Failed;}}}
}

Entity

using System;
using Autodesk.Revit.DB;
using Autodesk.Revit.DB.ExtensibleStorage;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;namespace ParameterBasicDemo
{[Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]public class WallExternalStorageCmd : IExternalCommand{public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements){try{UIDocument uidoc = commandData.Application.ActiveUIDocument;Wall wall = PickWall(uidoc);StoreDataInWall(wall, XYZ.Zero);return Autodesk.Revit.UI.Result.Succeeded;}catch (Exception ex){message = ex.Message;return Autodesk.Revit.UI.Result.Failed;}}private Wall PickWall(UIDocument uidoc){Wall wall = null;while (null == wall){Reference reference = uidoc.Selection.PickObject(ObjectType.Element);wall = uidoc.Document.GetElement(reference.ElementId) as Wall;}return wall;}//创建一个数据结构，将其附加到墙上，用数据填充它，然后从墙上检索数据void StoreDataInWall(Wall wall, XYZ dataToStore){using (Transaction createSchemaAndStoreData = new Transaction(wall.Document, "tCreateAndStore")){createSchemaAndStoreData.Start();SchemaBuilder schemaBuilder = new SchemaBuilder(new Guid("720080CB-DA99-40DC-9415-E53F280AA1F0"));schemaBuilder.SetReadAccessLevel(AccessLevel.Public); // 读权限：所有用户 schemaBuilder.SetWriteAccessLevel(AccessLevel.Vendor); // 可写权限：发行商schemaBuilder.SetVendorId("ADSK"); // 必须，由于可写权限为VendorschemaBuilder.SetSchemaName("WireSpliceLocation");FieldBuilder fieldBuilder = schemaBuilder.AddSimpleField("WireSpliceLocation", typeof(XYZ)); // create a field to store an XYZfieldBuilder.SetSpec(SpecTypeId.Length);fieldBuilder.SetDocumentation("A stored location value representing a wiring splice in a wall.");Schema schema = schemaBuilder.Finish(); // 注册外部存储的数据结构Entity entity = new Entity(schema); // 创建该数据结构类型的数据实体Field fieldSpliceLocation = schema.GetField("WireSpliceLocation"); // 获得数据结构的字段entity.Set<XYZ>(fieldSpliceLocation, dataToStore, UnitTypeId.Meters); // 设置数据实体的指定字段的值wall.SetEntity(entity); // 存储数据实体到墙元素// 读取墙上的外部数据Entity retrievedEntity = wall.GetEntity(schema);XYZ retrievedData = retrievedEntity.Get<XYZ>(schema.GetField("WireSpliceLocation"), UnitTypeId.Meters);createSchemaAndStoreData.Commit();}}}
}

快速获取外部存储参数

方法1

在LookUp上获取所需的外部存储的guid，得到schema，再得到entity，然后通过get方法输入参数的名称得到参数的值

Schema schema = Schema.Lookup(new Guid("{*****************}"));
Entity entity = ele.GetEntity(schema);
string data = entity.Get<string>(schema.GetField("id"));

方法2

            string data = null;IList<Guid> listGuids = ele.GetEntitySchemaGuids().ToList();foreach (Guid guid in listGuids){Schema schema = Schema.Lookup(guid);if (schema.SchemaName == "schema名称"){Entity entity = ele.GetEntity(schema);data = entity.Get<string>(schema.GetField("参数名称"));}}